OK, here is the story. I rebuilt my perkins 3 cyl this summer and got a new fuel pump amongst other new parts...the old fuel pump leaked a bit, and also shows signs of wear since the diaphram is starting to tear a bit...but it still worked.
So after rebuild, I put the new pump on, upon first start, bled the lines and it ran pretty good the first night...then the next day I ran it in the field for a few hours pulling a disc harrow and it had lots of power even at half throttle...but the new pump began to leak, so I called ytmag and they sent me a replacement....the new one(s) are sparex, the old original one is genuine.
I finally got the new one and put it on, and no leaks...that's good, and I proceeded to bleed the system. I've been bleeding the system all week and it still has air...it doesn't run with enough power to pull a disc harrow and I can only run it in low with the throttle at 1800-2000 rpm.
So today I thought I would bleed it again, each time having someone operate the lift pump and I would loosen the banjo fitting above the secondary filter with the fuel stop stopped and I would see air bubbles come out until no more. Then put the fuel stop in (engine still off) and would slack the bottom bleed screw on the injector pump until a jet stream would shoot out while pumping the lift pump...then close, and do the same for the upper bleed screw on the injector pump...these two screws take a 5/16 wrench and the banjo takes a 5/8.
So once again, it would run without much power at all, would take a bit to get up to higher rpm when pressing on the pedal, was slower when lifting the rear attachment or loader while trying to maintain adequate rpm.
So then I figured maybe the second fuel pump is generating air somehow...so I removed it, put my old genuine pump on...this pump has no lift lever since someone broke it off and it pretty much flows fuel out freely like it was a gravity system...so again I bled the system, only once, and the tractor started incredibly strong, no fluctuations in idle or rpm at any throttle, and I put a disc harrow in the ground and it pulled it for hours, even uphill with tons of power...so now I think maybe the second fuel pump is faulty or something...but I have no idea how it could be faulty or what I should say to ytmag.
Maybe the newer (second) fuel pump is working so strong it is pulling air in from some spot prior to it, or within it, that is creating the air...or maybe it is the wrong pump for my tractor, although the first one that leaked ran strong that first few hours in the field...I'm a bit stumped on this...can anyone offer any advice?
The reason I don't want to run the old genuine too much, is if I run the tractor up a very steep incline, the tractor dies on me, since it is prettty much a gravity feed system at that point...I then have to bleed the system AND the injector nuts which is a hassle cuz I have to raise the fuel tank...if I don't go up any steep inclines, the tractor will run flawless and incredible strong.
Has anyone had anything like this happen to them?
So after rebuild, I put the new pump on, upon first start, bled the lines and it ran pretty good the first night...then the next day I ran it in the field for a few hours pulling a disc harrow and it had lots of power even at half throttle...but the new pump began to leak, so I called ytmag and they sent me a replacement....the new one(s) are sparex, the old original one is genuine.
I finally got the new one and put it on, and no leaks...that's good, and I proceeded to bleed the system. I've been bleeding the system all week and it still has air...it doesn't run with enough power to pull a disc harrow and I can only run it in low with the throttle at 1800-2000 rpm.
So today I thought I would bleed it again, each time having someone operate the lift pump and I would loosen the banjo fitting above the secondary filter with the fuel stop stopped and I would see air bubbles come out until no more. Then put the fuel stop in (engine still off) and would slack the bottom bleed screw on the injector pump until a jet stream would shoot out while pumping the lift pump...then close, and do the same for the upper bleed screw on the injector pump...these two screws take a 5/16 wrench and the banjo takes a 5/8.
So once again, it would run without much power at all, would take a bit to get up to higher rpm when pressing on the pedal, was slower when lifting the rear attachment or loader while trying to maintain adequate rpm.
So then I figured maybe the second fuel pump is generating air somehow...so I removed it, put my old genuine pump on...this pump has no lift lever since someone broke it off and it pretty much flows fuel out freely like it was a gravity system...so again I bled the system, only once, and the tractor started incredibly strong, no fluctuations in idle or rpm at any throttle, and I put a disc harrow in the ground and it pulled it for hours, even uphill with tons of power...so now I think maybe the second fuel pump is faulty or something...but I have no idea how it could be faulty or what I should say to ytmag.
Maybe the newer (second) fuel pump is working so strong it is pulling air in from some spot prior to it, or within it, that is creating the air...or maybe it is the wrong pump for my tractor, although the first one that leaked ran strong that first few hours in the field...I'm a bit stumped on this...can anyone offer any advice?
The reason I don't want to run the old genuine too much, is if I run the tractor up a very steep incline, the tractor dies on me, since it is prettty much a gravity feed system at that point...I then have to bleed the system AND the injector nuts which is a hassle cuz I have to raise the fuel tank...if I don't go up any steep inclines, the tractor will run flawless and incredible strong.
Has anyone had anything like this happen to them?